如图所示在调节平衡后的杠杆两侧分别挂上相同规格的钩码杠杆处于平衡状态.如果两侧各去掉一个钩码则 A.左端下降b.右端下降c.仍然 Template




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tomski如图所示在调节平衡后的杠杆两侧分别挂上相同规格的钩码杠杆处于平衡状态.如果两侧各去掉一个钩码则 a.左端下降b.右端下降c.仍然 coloring